Blast-pressure-regulating valve.



Patented Feb. 10, 1914.

W. MELAS.

BLAST PRESSURE REGULATING VALVE.

APPLICATION FILED JULY 19, 1913.

NIW/weee d OLUMBIA PLNDGRAPH C0., WASHINGTON, DA C.

UNITED sfrnras PATENT onirica.

WILLIAM MELAS, OF RIDLEY PARK, PENNSYLVANIA, ASSIGNOR OF ONE-HALF 'lO DAVID TOWNSENID, OF PHILADELPHIA, PENNSYLVANIA.

BLAST-PRESSURE-REGULATING VALVE.

Specification of Letters Patent.

Patented Feb. 10, 1914.

To all 'whom it may concern:

Be it known that I, VILLIAM MnLAs, a citizen of the United States, residing at Ridley Park, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Blast-Pressure-Regulating Valves, of which the following is a specification.

In certain metallurgical and thermal operations, such as melting in cupolas and other furnaces and for the heat treatment of metals and other substances; a blast of air is required under varying pressures and conditions to support and regulate the combustion of the fuel, which blast should be easily and quickly controlled as to pressure and amount without interfering with the melting or heating operation.

It is the purpose of my invention to provide a blast pressure regulating valve which can be used in any axial position. To provide a blast regulating valve which can be used in connection with a blast gage. To provide a blast regulating valve which can be operated or set from any point for any range of pressures desired. To provide a blast regulating valve with means for varying the range of pressures under which it can be operated. To provide a blast regulating valve which is sensitive to slight variations in pressure. To provide a blast regulating valve which can be used as an unloading valve and safety valve.

In the drawing Figure I. is a longitudinal sectional view of said valve, showing same in connection with a blast gage. Fig. II. is a cross sectional view through the operating mechanism as viewed from A B. Fig. III. is a longitudinal sectional view of said valve at right angles to the plane of Fig. I. and viewed from C D. Fig. IV. is an enlarged axial section through the central hub of valve.

Referring to the form of my invention shown in Figs. I, II, III and IV, it will be seen that 3 indicates a section through a blast pipe to which the valve is connected. The blast pipe is crimped and carries the loose flange 4e which is connected to the valve seat iange 6 by a number of bolts 5. The valve seat flange has a circular opening 7 flaring outwardly from the pipe end. The surface 8 of this opening conforms with the shape of the rim on the valve 11. The valve seat flange has bosses 9, tapped at right angles thereto to receive the threaded ends of the guide rods 10. The valve surface toward the blast pipe is a segment of a sphere with a slightly raised rim on the circumference, said rim fitting the surface 3 of the valve seat flange. The valve 11 is provided with bosses 12, which are bored out parallel to the axis so that the valve may slide on the guide rods 10. The bosses 12 are connected by ribs 18 to a central hub 13 which is bored out to receive the adjustable pipe 1G. The free ends 19 of the guide rods 10 form shoulders for the bosses 23 of a yoke 21, said bosses being connected by ribs 24 to a central hub 22 of said yoke. rIhe hub 22 is bored to receive the end 26 of pipe 15, which end is firmly fastened in said hub 22 by a set screw 25. The yoke is fastened to the guide rods 10 by the nuts 20. The threaded end 26 of pipe 15 is also provided with an internal pipe thread to receive the end of pipe 27 which is in connection with a blast gage 28.

The operating mechanism is centrally located and consists of a helical spring 141. surrounding pipes 15 and 16 and abutting with one end against a recess in hub 13 and with the other end against a recess in the hub 17 of bevel wheel 29. Hub 17 of bevel wheel 29 is threaded to register with thread on the outside of pipe 15 and has a hollow cylindrical extension 30 of somewhat smaller outside diameter. The outside surface of this extension 30 fits in the bore of hub 33 of carrier-yoke 31 and an axial movement of bevel wheel 29 with reference to the carrieryoke is prevented by a collar 34 secured by a set screw 35 to the end of the cylindrical extension 30. The carrier-yoke has outside lugs 32, provided with bores parallel to the axis to fit slidably on the guide rods 10, said lugs being connected to the central hub 33 by ribs 36. The hub 33 carries a boss 37 whose axis is at right angles to the axis of hub 33. Boss 37 is threaded axially to receive the threaded end 38 of stud 39 on which can revolve the combination of a chain wheel 40 and bevel wheel 41, said bevel wheel 4:1 being in engagement with bevel wheel 29. Combination LlCO-ll is prevented from coming olf its axis by a washer and cotterpin 42 on stud 39. The chain wheel Ll0 can beturned bv means of chain 43.

The adjustment and operation of the arrangement heretofore described is as follows -The adjuster pipe 16 is screwed into such a position on pipe 15 as is determined by the maximum pressure for which the valve has to be used, a properly proportioned spring lll having been selected. By revolving the combination 10.-41 by means of chain e3 said combination will move parallel to the axis of bevel wheel 29 and carrier-yoke 31 upon the stationary pipe 15, thereby increasing or diminishing the compression of spring 14E according to the direction of motion. 1f the combination moves toward the valve its motion is finally arrested by wheel 29 coming in contact with the end of adjuster pipe 16; and in this position the valve is set for blowing off atthe maximum pressure desired. 1f the combination moves toward the yoke 21 its motion is nally arrested by contact of end of cy lindrical extension 30 with hub 22 and before this takes place the compression of spring lil has been fully released so that the valve 11 is fully open and can act as an unloading valve, discharging all the air or gas which is furnished to the blast pipe by the mechanical source of supply, such as blower, etc.

The maximum pressure desired can be varied by proper adjustment of adjuster pipe 16.

Any intermediate pressure between the maximum desired and the unloading position can be obtained by moving the combination in the proper position on stationary pipe 15. The pressure obtained is shown immediately on the blast gage 28.

Having thus described the purpose, useulness and operation of my invention, l claims* 1. In a blast regulating valve, the combination of a valve seat flange, having means to fasten it to a blast pipe, having a. circular opening, forming a valve seat, and having bosses arranged parallel to the axis of said opening, said bosses being tapped axially; an axially movable valve having a rim conforming in size and shape with the valve seat on the flange and having bosses arranged parallel to `the axis of said valve, said bosses being bored axially and having a central hub with an axial bore and a recess; a number of stationary guides arranged parallel to the axis of said valve seat opening and being screwed with one end into the bosses on said valve seat flange; a stationary yoke connecting the tree ends of the guides and having a central hub in axial alinement with the valve and valve seat opening, said hub being axially tapped; a threaded stationary pipe stem in axial alinement with the valve and valve seat opening, said pipe stem extending with one end into the blast pipe or blast chamber, the other end being screwed into the central hub of said stationary yoke and being locked in position by a set screw in said hub, and having means for attaching a blast gage thereto; an axially movable carrier -yoke located between said valve and said stationary yoke having means for guiding it axially and having a central boss with a bore in axial alinement with said valve and carrying on said central boss a stationary stud; a bevel wheel with an internally threaded hub, engaging the thread of said pipe stem, said hub having a hollow cylindrical extension litting in the bore of the central boss of the carrier yoke and having means to prevent an axial movement thereof; a combined chain and bevel wheel fitted to revolve on the stud aforementioned, said bevel wheel being in engagement with the bevel wheel in the carriereyoke; an axially adjustable pressure adjuster, having an internal thread fitting the thread of the pipe stem and an outside diameter corresponding with the axial bore in central hub of valve; a helical spring located between said valve and said bevel wheel in central hub of carrier-yoke, said spring surrounding said pipe stem and said pressure adjuster.

2. 1n a blast regulating valve the combi nation of a valve seat flange, having means to fasten it to a. blast pipe, having a circular opening, forming a valve seat; an axially movable valve with a rim iitting said valve seat and having a central hub withv an axial bore, said valve having means to guide it axially; a number of stationary guides, arranged parallel to the axis of said valve seat opening and being fastened to the valve seat flange; a stationary yoke connecting the free ends of the guides and having a hub bored in axial alinement with the valve seat opening; a threaded stationary pipe stem in axial alinement with the valve seat opening, extending with one end into the blast pipe and fastened with the other end to the hub of the stationary yoke and having means for attaching a blast gage thereon; an axially movable carrier-yoke located between said valve and said stationary yoke, having means for guiding it axially and having a boss with a bore in axial alinement with said valve and carrying a stationary stud; a bevel wheel with an internally threaded hub engaging the thread of said pipe stem, said hub fitting in the bore of the boss of the carrier-yoke and having means to prevent an axial movement; a combined chain and bevel wheel revolving on the stud aforementioned, said bevel wheel being in engagement with the bevel wheel on the carrier-yoke; an internally threaded and axially adjustable pressure adjuster, engaging the thread of the pipe stem and tting the bore in central hub ol valve; a helical spring located between said valve and said carrier yoke and surrounding said pipe stem and said pressure adjuster.

3. In a blast regulating valve the combination of a valve seat flange, having means to fasten it to a blast pipe, having an opening forming a valve seat; an axially mo-vable valve fitting said seat and in axial alinement therewith, having a hub with an axial bore, said valve having means for guiding it axially; a number of stationary guides, arranged parallel to the axis of said axial bore and fastened to the valve seat flange; a stationary yoke connecting the free ends of the guides and having a bored hub in axial alinement wit-h the bore of valve hub; a threaded stationary pipe stem in axial alinement with said hubs, extending with one end into the blast pipe and fastened with the other end to the hub of the stationary yoke and having means for attaching a blast gage thereto; an axially movable carrier-yoke located between said valve and said stationary yoke, having means for guiding it axially and carrying a pair of bevel wheels and a chain wheel, one bevel wheel being in axial alinement with the bore of valve hub having an internal thread to fit thread on pipe stem and having means to prevent an axial movement in relation to the carrieryoke, the other bevel wheel being in engagement with the bevel wheel aforementioned and revolving in rigid connection with a chain wheel on a stud fastened to the carrieryoke; adjustable means for limiting the axial movement of the carrier-yoke toward the valve; a helical spring located between said valve and Said carrier-yoke and surrounding said pipe stem.

fl. In a blast regulating valve the combination of an axially movable valve, fitting a suitable seat in a blast pipe and having an axial bore astationary threaded pipe stem in axial alinement with and extending with one end through said axial bore in the valve into the blast p-ipe and being rigidly connected with the blast pipe at the other end, said pipe stem having means to att-ach a blast gage thereto; there being on said pipe stem an axially movable operating mechanism consisting of a pair of bevel wheels and a chain wheel, one of the bevel wheels having a threaded hub in engagement with thread on pipe stem, the other bevel wheel being in rigid connection with a chain wheel and engaging the bevel wheel on pipe stem; an axially adjustable pressure adjuster surrounding the axial bore of pipe and tting the valve stem; a helical spring located between said valve and said bevel wheel with threaded hub and surrounding the pipe stem.

In testimony whereof I have aiixed my signature in presence of two witnesses.

WILLIAM MELAS. Witnesses:

HARRY P. GREEvEs, O. M. BonHM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

